ESA · Space

ESA and IAU Collaborate to Preserve Dark and Quiet Skies

The European Space Agency (ESA) and the International Astronomical Union’s Centre for the Protection of the Dark and Quiet Sky (IAU CPS) have partnered to address the growing interference from satellites impacting astronomical observations and stargazing.

The increasing number of satellites in low-Earth orbit poses a threat to astronomy through reflected sunlight and radio frequency interference. These satellites can create bright streaks in telescope images and emit radio signals that disrupt sensitive radio telescopes, hindering research into the Universe's origins, habitable worlds, and asteroid hazards.

Beyond scientific research, the night sky is a shared cultural heritage and vital for certain animal species' navigation. Preserving dark skies is therefore important for both human heritage and the natural environment.

Solutions to mitigate interference must begin during the satellite design phase. Engineers can implement choices to limit unwanted reflections and radio emissions, developing darker surfaces and radio-quiet electronics.

ESA will contribute its technical expertise, while the IAU CPS brings together astronomical institutions, researchers, companies, and citizens. This collaboration aims to foster dialogue between astronomers and satellite operators, support new technologies, and promote best practices for dark and quiet skies.

The partnership seeks to balance the growing use of space with the preservation of unobstructed views of the cosmos, aligning with principles of responsible and sustainable space activities.

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